2006-10-03 2023-08-25 Expert Review David B. Johnson, David A. Maltz, Yih-Chun Hu DSR Option Types are 8-bit values, structured as three subfields: Unk: If set, SHOULD respond to such a DSR option with a Route Error of type OPTION_NOT_SUPPORTED Act: a two-bit field indicating how such a node that does not support this Option Type MUST process the packet: 00 = Ignore Option 01 = Remove Option 10 = Mark Option 11 = Drop Packet 0 0 00 0 PadN option 1 0 00 1 Route Request 2 0 00 2 Route Reply 3 0 00 3 Route Error option 4-31 Unassigned 32 0 01 0 Acknowledgement option 33-95 Unassigned 96 0 11 0 DSR Source Route option 97-127 Unassigned 128 1 00 0 Timeout option 129 1 00 1 Destination and Flow ID option 130-159 Unassigned 160 1 01 0 Acknowledgement Request option 161-223 Unassigned 224 1 11 0 Pad1 option Expert Review David B. Johnson, David A. Maltz, Yih-Chun Hu 0 Reserved 1 NODE_UNREACHABLE 2 FLOW_STATE_NOT_SUPPORTED 3 OPTION_NOT_SUPPORTED 4-128 Unassigned 129 UNKNOWN_FLOW 130 DEFAULT_FLOW_UNKNOWN